0
Assigned ID: 682
----- Attempting Submission 1 (Fri Apr 10 19:00:50 GMT 2015) -----
HST Phase I Proposal 682 (fegroup-apt) successfully submitted.
Receipt: # 682-1
0
----- Attempting Submission 1 (Mon Jul 06 14:40:53 GMT 2015) -----
HST Phase II Proposal 14232 (fegroup-phase2.apt) successfully submitted.
Receipt: # 14232-1
----- Attempting Submission 2 (Mon Feb 29 16:39:36 GMT 2016) -----
STIS Observations of Metal-Poor Stars: Direct Confrontation with Nucleosynthetic Predictions
We propose to obtain STIS NUV echelle spectra (2300-3100 Angstroms) of three extremely metal-poor ([Fe/H] ~ -3) main-sequence turnoff stars. We will analyze these spectra to obtain accurate elemental abundances from many transitions of neutral and singly-ionized species of Fe-group elements (Sc, Ti, V, Cr, Mn, Fe, Co, Ni; atomic numbers 21 to 28). Relative abundances of this element group can be predicted theoretically in detail, and they can be interpreted in terms of stellar nucleosynthesis and Galactic chemical evolution. However, their observed abundances in low-metallicity stars are unreliable at present, and there are substantial clashes with theoretical predictions. Our proposed observations, built on a solid foundation of recent and new laboratory transition studies by our group, will finally provide reliable Fe-group abundances that can at last directly confront the Galactic chemical evolution predictions for these important elements.
There are three target stars. Each one is a metal-poor main sequence turn-off star (late-F spectral type, [Fe/H] ~ -3). Our goal is to obtain as much S/N as possible in the allocated orbits. Our S/N targets are ~50/1 at 2378 Angstroms for each star. The instrumental setup is designed to obtain continuous R~30,000 spectra from ~2300 Angstroms to ~3100 Angstroms. I have verified all three target confirmation charts.
-- IUR, 06 July 2015
COOL STARS
12
false
true
false
false
false
false
SUPPORTED
STAR
F3-F9
POPULATION II
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
Coords from UCAC4 (via Vizier). PM from UCAC4 (via Vizier). Parallax from Hipparcos re-reduction (via Vizier).
J2000
J2000
STAR
F3-F9
POPULATION II
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
Coords from UCAC4 (as computed by Vizier). PM from UCAC4 (via Vizier).
J2000
J2000
STAR
F3-F9
POPULATION II
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
Coords from UCAC4 (as computed by Vizier). PM from UCAC4 (via Vizier). Parallax from Hipparcos re-reduction (via Vizier).
J2000
J2000
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
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